Someone called me up and asked if I had jumper cables and could I jumpstart his semi with my 2018 CR-V because his semi-truck's battery would near dead (shouldn't have let his kids play in it!). This did not sound like a good idea and I said I would get back to him. Called the local repair shop (not Honda) and asked it this was a smart thing to do. "Absolutely NOT", they said. This would fry the onboard computer right out of the car! Anyone else ever have such a request and has anyone ever suffered the consequences or was successful in this adventure. The semi's driver swore that where he works they jump start semis with passenger cars.

 

some info to help. https://freightviking.com/can-car-ju...ttery%20system.

 

Personally, I would decline to do this because of the huge potential danger to my vehicle. But, sometimes I do have an extra 12 volt car battery around and would charge it up to full. Then, use it alone to give a jump start. 12 volt system only. Heard that some semi are 24 volt. In that case, No Way. As much as I would like to help others, I need to protect myself first.